CN207967914U - A kind of voltage protection of photovoltaic parallel in system - Google Patents
A kind of voltage protection of photovoltaic parallel in system Download PDFInfo
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- CN207967914U CN207967914U CN201820047526.9U CN201820047526U CN207967914U CN 207967914 U CN207967914 U CN 207967914U CN 201820047526 U CN201820047526 U CN 201820047526U CN 207967914 U CN207967914 U CN 207967914U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a kind of voltage protection of photovoltaic parallel in system, when photovoltaic parallel in system meets overvoltage protection condition, by overvoltage crowbar output overvoltage trip signal, and controls breaker and executes trip operation；When photovoltaic parallel in system meets under-voltage protection condition, undervoltage trip signal is exported by under-voltage protecting circuit, and controls breaker and executes trip operation.Therefore, when system inverter trouble or failure, the breaker on power line is set between inverter and power grid by control and executes trip operation, protects power grid not to be hit, to ensure the safe and stable operation of power grid.
Description
Technical field
The utility model is related to electrical protection apparatus technical fields, more specifically, being related to a kind of photovoltaic parallel in system
Voltage protection.
Background technology
Currently, distributed generation system or micro-grid system are tool power generation with broad prospects for development and the energy
Comprehensive utilization mode, such photovoltaic parallel in system are widely used to field of photovoltaic power generation.With distributed generation system and micro-
The popularization of network system, the increase of aggregates power, the influence that safe and stable operation brings the safe and stable operation of power grid are got over
Come bigger.
Currently, most distributed generation system and micro-grid system, generally realize its voltage by the inverter in system
Protection, and its inverter ac side is directly accessed power grid by breaker and generates electricity by way of merging two or more grid systems.Although reducing photovoltaic in this way
The cost of power generation, but any protection equipment is not equipped between its inverter ac side and power grid, when system inverter failure
Or when failure, system overvoltage or under-voltage prodigious impact will be brought to power grid.
Utility model content
In view of this, the utility model discloses a kind of voltage protection of photovoltaic parallel in system, it is inverse in system to realize
When becoming device trouble or failure, system overvoltage or the under-voltage impact to power grid are avoided.
To achieve the above object, technical solution provided by the present application is as follows：
A kind of voltage protection of photovoltaic parallel in system, including：
Breaker, the breaker are set on the power line between the inverter of photovoltaic parallel in system and power grid；
When it is "on" position to detect the breaker, the circuit-breaker status detection circuit of high level is exported；
When detecting the inverter output current more than pre-set current value, the inverter output current inspection of high level is exported
Slowdown monitoring circuit；
When the photovoltaic parallel in system meets overvoltage protection condition, output overvoltage trip signal, and control the open circuit
Device executes the overvoltage crowbar of trip operation；The input terminal of the overvoltage crowbar is detected with the circuit-breaker status respectively
The output end of circuit is connected with the output end of the inverter output current detection circuit；The output end of the overvoltage crowbar
It is connected with the control terminal of the breaker；
When the photovoltaic parallel in system meets under-voltage protection condition, undervoltage trip signal is exported, and control the open circuit
Device executes the under-voltage protecting circuit of trip operation；The input terminal of the under-voltage protecting circuit is detected with the circuit-breaker status respectively
The output end of circuit is connected with the output end of the inverter output current detection circuit；The output end of the under-voltage protecting circuit
It is connected with the control terminal of the breaker.
Preferably, the overvoltage crowbar includes：First overvoltage protection allows circuit, the second overvoltage protection to allow electricity
Road, over-pressed decision circuitry, first and door and the first delay circuit；Wherein：
First overvoltage protection allows the output end of circuit, the output end of second overvoltage protection permission circuit and institute
The output end for stating over-pressed decision circuitry is connected with described first with three input terminals of door one-to-one correspondence respectively；
Described first is connected with the output end of door with the input terminal of first delay circuit；
The output end of first delay circuit is connected with the control terminal of the breaker.
Preferably, the first overvoltage protection permission circuit includes：
When it is input state to detect overvoltage pressing plate, the overvoltage pressing plate state detection circuit of high level is exported.
Preferably, the second overvoltage protection permission circuit includes：First or door；
Described first or door two input terminals respectively with the output end of the circuit-breaker status detection circuit, the inversion
The output end of device output current detection circuit, which corresponds, to be connected；
Described first or the output end of door be connected with described first with an input terminal of door.
Preferably, the over-pressed decision circuitry includes：
When the voltage between the inverter ac ab phases is more than default ceiling value, the first comparison for exporting high level is electric
Road；The input terminal of first comparison circuit and the voltage transformer output end phase being set between the inverter ac ab phases
Even；
When the voltage between the inverter ac bc phases is more than the default ceiling value, the second ratio of high level is exported
Compared with circuit；The input terminal of second comparison circuit is exported with the voltage transformer being set between the inverter ac bc phases
End is connected；
When the voltage between the inverter ac ca phases is more than the default ceiling value, the third ratio of high level is exported
Compared with circuit；The input terminal of the third comparison circuit is exported with the voltage transformer being set between the inverter ac ca phases
End is connected；
Second or door, described second or door three input terminals respectively with the output end of first comparison circuit, described
The output end of the output end of second comparison circuit and the third comparison circuit, which corresponds, to be connected；Described second or door output
End is connected with described first with an input terminal of door.
Preferably, the under-voltage protecting circuit includes：First under-voltage protection allows circuit, the second under-voltage protection to allow electricity
Road, third under-voltage protection permission circuit, under-voltage decision circuitry, second and door and the second delay circuit；Wherein：
First under-voltage protection allows the output end of circuit, second under-voltage protection to allow the output end of circuit, institute
State third under-voltage protection allow circuit output end and the under-voltage decision circuitry output end respectively with described second with door
Four input terminals, which correspond, to be connected；
Described second is connected with the output end of door with the input terminal of second delay circuit；
The output end of second delay circuit is connected with the control terminal of the breaker.
Preferably, the first under-voltage protection permission circuit includes：
When it is input state to detect low-voltage pressing plate, the low-voltage pressing plate state detection circuit of high level is exported.
Preferably, the second under-voltage protection permission circuit includes：Third or door；Wherein：
Two input terminals of the third or door respectively with the output end of the circuit-breaker status detection circuit, the inversion
The output end of device output current detection circuit, which corresponds, to be connected；
The output end of the third or door is connected with described second with an input terminal of door.
Preferably, the under-voltage decision circuitry includes：
When the voltage between the inverter ac ab phases is less than default lower limit value, the 4th comparison for exporting high level is electric
Road；The input terminal of 4th comparison circuit and the voltage transformer output end phase being set between the inverter ac ab phases
Even；
When the voltage between the inverter ac bc phases is less than the default lower limit value, the 5th ratio of high level is exported
Compared with circuit；The input terminal of 5th comparison circuit is exported with the voltage transformer being set between the inverter ac bc phases
End is connected；
When the voltage between the inverter ac ca phases is less than the default lower limit value, the 6th ratio of high level is exported
Compared with circuit；The input terminal of 6th comparison circuit is exported with the voltage transformer being set between the inverter ac ca phases
End is connected；
Three input terminals of third and door, the third and door respectively with the output end of the 4th comparison circuit, described
The output end of the output end of 5th comparison circuit and the 6th comparison circuit, which corresponds, to be connected；The output of the third and door
End is connected with described second with an input terminal of door.
Preferably, the third under-voltage protection permission circuit includes：
When detecting voltage transformer disconnection, the voltage transformer state detection circuit of high level is exported；
First NOT gate；The input terminal phase of the output end of the voltage transformer state detection circuit and first NOT gate
Even；The output end of first NOT gate is connected with described second with an input terminal of door.
It can be seen from the above technical scheme that the voltage protection of photovoltaic parallel in system disclosed by the utility model,
When photovoltaic parallel in system meets overvoltage protection condition, by overvoltage crowbar output overvoltage trip signal, and open circuit is controlled
Device executes trip operation；When photovoltaic parallel in system meets under-voltage protection condition, undervoltage trip is exported by under-voltage protecting circuit
Signal, and control breaker and execute trip operation.Therefore, it when system inverter trouble or failure, is set to by control inverse
Become the breaker between device and power grid on power line and execute trip operation, protects power grid not to be hit, to ensure the peace of power grid
Full stable operation.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of structural representation of the voltage protection of photovoltaic parallel in system disclosed in the utility model embodiment
Figure；
Fig. 2 is a kind of structural schematic diagram of overvoltage crowbar disclosed in the utility model embodiment；
Fig. 3 is a kind of structural schematic diagram of under-voltage protecting circuit disclosed in the utility model embodiment.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
The utility model discloses a kind of voltage protection of photovoltaic parallel in system, to realize in system inverter failure or
When failure, system overvoltage or the under-voltage impact to power grid are avoided.
Specifically, the voltage protection of the photovoltaic parallel in system, referring to Fig. 1, including：Circuit-breaker status detection circuit
100, inverter output current detection circuit 200, overvoltage crowbar 300, under-voltage protecting circuit 400 and breaker 500；Its
In：
The output end of circuit-breaker status detection circuit 100 respectively with the input terminal of overvoltage crowbar 300 and under-voltage protection
The input terminal of circuit 400 is connected；
The output end of inverter output current detection circuit 200 respectively with the input terminal of overvoltage crowbar 300 and under-voltage
The input terminal of circuit 400 is protected to be connected；
The output end of overvoltage crowbar 300 is connected with the control terminal of breaker 500；
The output end of under-voltage protecting circuit 400 is connected with the control terminal of breaker 500；
Breaker 500 is set on the power line between inverter and power grid.
Specifically operation principle is：
Circuit-breaker status detection circuit 100 is used to, when it is "on" position to detect breaker 500, export high level；
Inverter output current detection circuit 200 is used to be more than in advance when the inverter output current of detection photovoltaic parallel in system
If when current value, exporting high level；Preferably, which could be provided as 1A, this is not specifically limited, and can regard
Depending on its concrete application environment.
Overvoltage crowbar 300 is for receiving circuit-breaker status detection circuit 100 and inverter output current detection circuit
200 output signal, when photovoltaic parallel in system meets overvoltage protection condition, output overvoltage trip signal, and control breaker
500 execute trip operation；
Specifically, the overvoltage protection condition includes but not limited to：Overvoltage pressing plate is input state, and inverter ac side is appointed
One line voltage is more than default ceiling value, and, circuit-breaker status detection circuit 100 and/or inverter output current detection circuit 200
Export high level.
Under-voltage protecting circuit 400 is for receiving circuit-breaker status detection circuit 100 and inverter output current detection circuit
200 output signal exports undervoltage trip signal, and control breaker when photovoltaic parallel in system meets under-voltage protection condition
500 execute trip operation.
Specifically, the under-voltage protection condition includes but not limited to：Low-voltage pressing plate is input state, and inverter ac side is appointed
One line voltage is less than default lower limit value, and voltage transformer wiring is normal, and, circuit-breaker status detection circuit 100 and/or inverter
Output current detection circuit 200 exports high level.
The overvoltage trip signal and undervoltage trip signal, can be used in showing on the spot or teletransmission, not do specific limit herein
It is fixed.
The voltage protection of the photovoltaic parallel in system provided in this embodiment, when photovoltaic parallel in system meets overvoltage protection
When condition, by 300 output overvoltage trip signal of overvoltage crowbar, and controls breaker 500 and execute trip operation；Work as photovoltaic
When grid-connected system meets under-voltage protection condition, undervoltage trip signal is exported by under-voltage protecting circuit 400, and control breaker
500 execute trip operation.Therefore, it when system inverter trouble or failure, is set between inverter and power grid by control
Breaker 500 on power line executes trip operation, protects power grid not to be hit, to ensure the safe and stable operation of power grid.
Another embodiment of the utility model additionally provides a kind of voltage protection of specific photovoltaic parallel in system, upper
On the basis for stating embodiment and Fig. 1, referring to Fig. 2, overvoltage crowbar 300 includes：First overvoltage protection permission circuit 301,
Second overvoltage protection allows circuit 302, over-pressed decision circuitry 303, first and door 304 and the first delay circuit 305；Wherein：
First overvoltage protection allows the output end of circuit 301, the output end of the second overvoltage protection permission circuit 302 and overvoltage
The output end of decision circuitry 303 is connected with first with three input terminals of door 304 one-to-one correspondence respectively；
First is connected with the output end of door 304 with the input terminal of the first delay circuit 305；
The output end of first delay circuit 305 is connected with the control terminal of breaker 500.
Preferably, the first overvoltage protection permission circuit 301 includes：Overvoltage pressing plate state detection circuit；
Overvoltage pressing plate state detection circuit is used to, when it is input state to detect overvoltage pressing plate, export high level.
Preferably, the second overvoltage protection permission circuit 302 includes：First or door；
First or door two input terminals respectively with the output end of circuit-breaker status detection circuit 100, inverter output electricity
The output end of current detection circuit 200, which corresponds, to be connected；
First or the output end of door be connected with first with an input terminal of door 304.
Second overvoltage protection allows circuit 302 to be used for：It is "on" position when detecting breaker 500, and/or, it is grid-connected
When the inverter output current of system is more than pre-set current value, high level is exported.
Preferably, over-pressed decision circuitry 303 includes：First comparison circuit 331, the second comparison circuit 332, third are more electric
Road 333 and second or door 334；Wherein：
The input terminal of first comparison circuit 331 and the voltage transformer output end phase being set between inverter ac ab phases
Even；
The input terminal of second comparison circuit 332 and the voltage transformer output end phase being set between inverter ac bc phases
Even；
The input terminal of third comparison circuit 333 and the voltage transformer output end phase being set between inverter ac ca phases
Even；
The output end of first comparison circuit 331, the output end of the second comparison circuit 332 and third comparison circuit 333 it is defeated
Outlet is connected with three input terminals one-to-one correspondence of second or door 334 respectively；
Second or the output end of door 334 be connected with first with an input terminal of door 304.
Specifically：
First comparison circuit 331 is used for when the voltage between inverter ac ab phases is more than default ceiling value, and output is high
Level；
Second comparison circuit 332 is used for when the voltage between inverter ac bc phases is more than default ceiling value, and output is high
Level；
Third comparison circuit 333 is used for when the voltage between inverter ac ca phases is more than default ceiling value, and output is high
Level.
Wherein, the concrete numerical value depend on the actual needs of ceiling value are preset, the utility model does not limit herein.
That is, over-pressed decision circuitry 303 is used for when any line voltage in inverter ac side is more than default ceiling value, output
High level.
To sum up, when overvoltage pressing plate is input state, the first overvoltage protection allows circuit 301 to export high level；When inverse
When becoming any line voltage of device exchange side more than default ceiling value, over-pressed decision circuitry 303 exports high level；When circuit-breaker status is examined
When slowdown monitoring circuit 100 and/or inverter output current detection circuit 200 export high level, the second overvoltage protection allows circuit 302 defeated
Go out high level.When the first overvoltage protection allows circuit 301, the second overvoltage protection to allow circuit 302 and over-pressed decision circuitry 303
When exporting high level, first exports high level with door 304, and otherwise, first exports low level with door 304.First exports with door 304
High level by after certain delay, by 305 output overvoltage trip signal of the first delay circuit, and controlling breaker 500
Execute trip operation.
In specific practical application, the delay duration of the first delay circuit 305 can depending on its concrete application environment,
It is not specifically limited herein, within the scope of protection of this application.
Additionally, it is preferred that, referring to Fig. 3, under-voltage protecting circuit 400 includes：First under-voltage protection allows circuit 401, second
Under-voltage protection allows circuit 402, third under-voltage protection to allow circuit 403, under-voltage decision circuitry 404, second and door 405 and second
Delay circuit 406；Wherein：
First under-voltage protection allows the output end of circuit 401, the second under-voltage protection to allow the output end of circuit 402, third
Under-voltage protection allow circuit 403 output end and under-voltage decision circuitry 404 output end it is defeated with four of door 405 with second respectively
Enter end one-to-one correspondence to be connected；
Second is connected with the output end of door 405 with the input terminal of the second delay circuit 406；
The output end of second delay circuit 406 is connected with the control terminal of breaker 500.
Preferably, the first under-voltage protection permission circuit 400 includes：Low-voltage pressing plate state detection circuit；
Low-voltage pressing plate state detection circuit is used to, when it is input state to detect low-voltage pressing plate, export high level.
Preferably, the second under-voltage protection permission circuit 402 includes：Third or door；Wherein：
Two input terminals of third or door are electric with the output end of circuit-breaker status detection circuit 100, inverter output respectively
The output end of current detection circuit 200, which corresponds, to be connected；
The output end of third or door is connected with second with an input terminal of door.
Second under-voltage protection allows circuit 402 to be used for：It is "on" position when detecting breaker 500, and/or, it is grid-connected
When the inverter output current of system is more than pre-set current value, high level is exported.
Preferably, third under-voltage protection permission circuit 403 includes：Voltage transformer state detection circuit 431 and first is non-
Door 432；Wherein：
The output end of voltage transformer state detection circuit 431 is connected with the input terminal of the first NOT gate；Voltage transformer shape
State detection circuit 431 is used for when detecting voltage transformer disconnection, exports high level；
The output end of first NOT gate 432 is connected with second with an input terminal of door 405.
Third under-voltage protection allows circuit 403 to be used to, when detection voltage transformer wiring is normal, export high level.
Preferably, under-voltage decision circuitry 404 includes：4th comparison circuit 441, the 5th comparison circuit 442, the 6th comparison are electric
Road 443 and third and door 444；Wherein：
The input terminal of 4th comparison circuit 441 and the voltage transformer output end phase being set between inverter ac ab phases
Even；
The input terminal of 5th comparison circuit 442 and the voltage transformer output end phase being set between inverter ac bc phases
Even；
The input terminal of 6th comparison circuit 443 and the voltage transformer output end phase being set between inverter ac ca phases
Even；
The output end of 4th comparison circuit 441, the output end of the 5th comparison circuit 442 and the 6th comparison circuit 443 it is defeated
Outlet is connected with third with three input terminals of door 444 one-to-one correspondence respectively；
Third is connected with the output end of door 444 with second with an input terminal of door 405.
Specifically：
4th comparison circuit 441 is used for when the voltage between inverter ac ab phases is less than default lower limit value, and output is high
Level；
5th comparison circuit 442 is used for when the voltage between inverter ac bc phases is less than default lower limit value, and output is high
Level；
6th comparison circuit 443 is used for when the voltage between inverter ac ca phases is less than default lower limit value, and output is high
Level.
Wherein, the concrete numerical value depend on the actual needs of lower limit value are preset, the utility model does not limit herein.
That is, under-voltage decision circuitry 404 is used for when any line voltage in inverter ac side is less than default lower limit value, output
High level.
To sum up, when low-voltage pressing plate is input state, the first under-voltage protection allows circuit 401 to export high level；When inverse
When becoming any line voltage of device exchange side less than default lower limit value, under-voltage decision circuitry 404 exports high level；When circuit-breaker status is examined
When slowdown monitoring circuit 100 and/or inverter output current detection circuit 200 export high level, the second under-voltage protection allows circuit 402 defeated
Go out high level；When voltage transformer wiring is normal, third under-voltage protection allows circuit 403 to export high level.When first under-voltage
Protection allows circuit 401, the second under-voltage protection that circuit 402, third under-voltage protection is allowed to allow circuit 403 and under-voltage decision circuitry
404 export high level when, second with door 405 export high level, otherwise, second with door 405 export low level.Second and door
The high level of 405 outputs by the second delay circuit 406 by after certain delay, exporting undervoltage trip signal, and control disconnected
Road device 500 executes trip operation.
In specific practical application, the delay duration of the second delay circuit 406 can depending on its concrete application environment,
It is not specifically limited herein, within the scope of protection of this application.
Remaining operation principle and above-described embodiment system, no longer repeat one by one herein.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only that
A little elements, but also include other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use this practicality new
Type.Various modifications to these embodiments will be apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest range consistent with features of novelty.
Claims (10)
1. a kind of voltage protection of photovoltaic parallel in system, which is characterized in that including：
Breaker, the breaker are set on the power line between the inverter of photovoltaic parallel in system and power grid；
When it is "on" position to detect the breaker, the circuit-breaker status detection circuit of high level is exported；
When detecting the inverter output current more than pre-set current value, the inverter output current detection electricity of high level is exported
Road；
When the photovoltaic parallel in system meets overvoltage protection condition, output overvoltage trip signal, and control the breaker and hold
The overvoltage crowbar of row trip operation；The input terminal of the overvoltage crowbar respectively with the circuit-breaker status detection circuit
Output end be connected with the output end of the inverter output current detection circuit；The output end of the overvoltage crowbar and institute
The control terminal for stating breaker is connected；
When the photovoltaic parallel in system meets under-voltage protection condition, undervoltage trip signal is exported, and control the breaker and hold
The under-voltage protecting circuit of row trip operation；The input terminal of the under-voltage protecting circuit respectively with the circuit-breaker status detection circuit
Output end be connected with the output end of the inverter output current detection circuit；The output end of the under-voltage protecting circuit and institute
The control terminal for stating breaker is connected.
2. the voltage protection of photovoltaic parallel in system according to claim 1, which is characterized in that the overvoltage protection electricity
Road includes：First overvoltage protection permission circuit, the second overvoltage protection permission circuit, over-pressed decision circuitry, first and door and first
Delay circuit；Wherein：
First overvoltage protection allows the output end of circuit, second overvoltage protection to allow the output end of circuit and the mistake
The output end of decision circuitry is pressed to be connected respectively with described first with three input terminals of door one-to-one correspondence；
Described first is connected with the output end of door with the input terminal of first delay circuit；
The output end of first delay circuit is connected with the control terminal of the breaker.
3. the voltage protection of photovoltaic parallel in system according to claim 2, which is characterized in that first overvoltage is protected
Protecting permission circuit includes：
When it is input state to detect overvoltage pressing plate, the overvoltage pressing plate state detection circuit of high level is exported.
4. the voltage protection of photovoltaic parallel in system according to claim 2, which is characterized in that second overvoltage is protected
Protecting permission circuit includes：First or door；
Described first or door two input terminals it is defeated with the output end of the circuit-breaker status detection circuit, the inverter respectively
The output end one-to-one correspondence for going out current detection circuit is connected；
Described first or the output end of door be connected with described first with an input terminal of door.
5. the voltage protection of photovoltaic parallel in system according to claim 2, which is characterized in that the overvoltage judges electricity
Road includes：
When the voltage between the inverter ac ab phases is more than default ceiling value, the first comparison circuit of high level is exported；
The input terminal of first comparison circuit is connected with the voltage transformer output end being set between the inverter ac ab phases；
When the voltage between the inverter ac bc phases is more than the default ceiling value, the second comparison for exporting high level is electric
Road；The input terminal of second comparison circuit and the voltage transformer output end phase being set between the inverter ac bc phases
Even；
When the voltage between the inverter ac ca phases is more than the default ceiling value, the third for exporting high level is more electric
Road；The input terminal of the third comparison circuit and the voltage transformer output end phase being set between the inverter ac ca phases
Even；
Second or door, described second or door three input terminals respectively with the output end of first comparison circuit, described second
The output end of the output end of comparison circuit and the third comparison circuit, which corresponds, to be connected；Described second or door output end with
Described first is connected with an input terminal of door.
6. the voltage protection of photovoltaic parallel in system according to claim 1, which is characterized in that the under-voltage protection electricity
Road includes：First under-voltage protection allows circuit, the second under-voltage protection that circuit, third under-voltage protection is allowed to allow circuit, under-voltage sentence
Deenergizing, second and door and the second delay circuit；Wherein：
First under-voltage protection allows the output end of circuit, second under-voltage protection to allow the output end of circuit, described the
Three under-voltage protections allow circuit output end and the under-voltage decision circuitry output end respectively with described second and four of door
Input terminal, which corresponds, to be connected；
Described second is connected with the output end of door with the input terminal of second delay circuit；
The output end of second delay circuit is connected with the control terminal of the breaker.
7. the voltage protection of photovoltaic parallel in system according to claim 6, which is characterized in that the first under-voltage guarantor
Protecting permission circuit includes：
When it is input state to detect low-voltage pressing plate, the low-voltage pressing plate state detection circuit of high level is exported.
8. the voltage protection of photovoltaic parallel in system according to claim 6, which is characterized in that the second under-voltage guarantor
Protecting permission circuit includes：Third or door；Wherein：
Two input terminals of the third or door are defeated with the output end of the circuit-breaker status detection circuit, the inverter respectively
The output end one-to-one correspondence for going out current detection circuit is connected；
The output end of the third or door is connected with described second with an input terminal of door.
9. the voltage protection of photovoltaic parallel in system according to claim 6, which is characterized in that the under-voltage judgement electricity
Road includes：
When the voltage between the inverter ac ab phases is less than default lower limit value, the 4th comparison circuit of high level is exported；
The input terminal of 4th comparison circuit is connected with the voltage transformer output end being set between the inverter ac ab phases；
When the voltage between the inverter ac bc phases is less than the default lower limit value, the 5th comparison for exporting high level is electric
Road；The input terminal of 5th comparison circuit and the voltage transformer output end phase being set between the inverter ac bc phases
Even；
When the voltage between the inverter ac ca phases is less than the default lower limit value, the 6th comparison for exporting high level is electric
Road；The input terminal of 6th comparison circuit and the voltage transformer output end phase being set between the inverter ac ca phases
Even；
Three input terminals of third and door, the third and door respectively with the output end of the 4th comparison circuit, the described 5th
The output end of the output end of comparison circuit and the 6th comparison circuit, which corresponds, to be connected；The output end of the third and door with
Described second is connected with an input terminal of door.
10. the voltage protection of photovoltaic parallel in system according to claim 6, which is characterized in that the third is under-voltage
Protection allow circuit include：
When detecting voltage transformer disconnection, the voltage transformer state detection circuit of high level is exported；
First NOT gate；The output end of the voltage transformer state detection circuit is connected with the input terminal of first NOT gate；Institute
The output end for stating the first NOT gate is connected with described second with an input terminal of door.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108011352A (en) * | 2018-01-11 | 2018-05-08 | 温州科宇电器有限公司 | A kind of voltage protection of photovoltaic parallel in system |
| CN112688275A (en) * | 2020-12-11 | 2021-04-20 | 漳州科华技术有限责任公司 | Inverter protection method and device and terminal equipment |
| CN117434333A (en) * | 2023-12-01 | 2024-01-23 | 深圳智芯微电子科技有限公司 | Micro-grid line voltage abnormality detection circuit, energy management system and electric equipment |
-
2018
- 2018-01-11 CN CN201820047526.9U patent/CN207967914U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108011352A (en) * | 2018-01-11 | 2018-05-08 | 温州科宇电器有限公司 | A kind of voltage protection of photovoltaic parallel in system |
| CN112688275A (en) * | 2020-12-11 | 2021-04-20 | 漳州科华技术有限责任公司 | Inverter protection method and device and terminal equipment |
| CN112688275B (en) * | 2020-12-11 | 2024-03-19 | 厦门科华数能科技有限公司 | Inverter protection method and device and terminal equipment |
| CN117434333A (en) * | 2023-12-01 | 2024-01-23 | 深圳智芯微电子科技有限公司 | Micro-grid line voltage abnormality detection circuit, energy management system and electric equipment |
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